Midrash sobre Exodo 40:23

6) — Take what you have brought" (i.e., you cannot deduce more than you begin with — Just as there (the tent of meeting, etc.) only one (lustration is required), here, too, (you may derive) only one (and not two)! It must, therefore, be written (Shemoth 40:23) "and he shall take off the linen garments which he put on." Would it enter your mind that he could take off anything other than he put on? (Why, then, need this be stated?) It must be to liken taking off to putting on, viz.: Just as putting on requires lustration of hands and feet, so, taking off.